The Plantronics APP-51 Electronic Hookswitch (EHS) cable for Polycom Phones (Savi & CS500 series) - This special cable communicates electronically with your compatible phone in order to eliminate the need for an HL10 lifter.
Only compatible with these Plantronics Savi and CS500 models:
- Plantronics CS540, CS510, CS520
- Plantronics Savi WO100, WO200, WO300 & WO350
- Plantronics Savi W740, W710, W720, W730, W745
This EHS Cable will ONLY work with the following phone models:
- SoundPoint IP 320*, 321*
- SoundPoint IP 330*, 331*
- SoundPoint IP 335, 430, 450, 550, 560, 650, 670
*The 320/321 and 330/331 require a 2.5mm to RJ-9 adapter available from Polycom (part# 2200-11095-002)
Please Note: If you have a older model Plantronics "CS" wireless headset (CS55, CS50, CS351, CS361, etc), you will need the Plantronics APP-5 EHS Cable instead.